Added audio board to inner cabinet, seen at bottom green LED. quality is so, so more to do with speakers, which are metal-cone 2W @ 4R. Board is Shure class D 2X2W. Tested closed cabinet for several hours with infared thermo gun and not much above ambient. Camera case with ARDrone boards @ 93F, acceptable. Sniff test of cabinet after opening revealed only normal remnants of old 20mm shells and surplus store vs telltale bakelite baking.